1 files changed, 67 insertions, 0 deletions
diff --git a/main/test/src/main/JavaCompileJarTests.scala b/main/test/src/main/JavaCompileJarTests.scala
new file mode 100644
index 00000000..37c64b05
--- /dev/null
+++ b/main/test/src/main/JavaCompileJarTests.scala
@@ -0,0 +1,67 @@
+package mill.main
+
+import mill.util.ScriptTestSuite
+import utest._
+
+object JavaCompileJarTests extends ScriptTestSuite(fork = false) {
+  def workspaceSlug = "java-compile-jar"
+  def scriptSourcePath = os.pwd / 'main / 'test / 'resources / 'examples / 'javac
+  val tests = Tests{
+    initWorkspace()
+    'test - {
+      if (!ammonite.util.Util.java9OrAbove) {
+        // Basic target evaluation works
+        assert(eval("classFiles"))
+        assert(eval("jar"))
+
+        val classFiles1 = meta("classFiles")
+        val jar1 = meta("jar")
+
+        assert(eval("classFiles"))
+        assert(eval("jar"))
+
+        // Repeated evaluation has the same results
+        val classFiles2 = meta("classFiles")
+        val jar2 = meta("jar")
+
+        assert(
+          jar1 == jar2,
+          classFiles1 == classFiles2
+        )
+
+        // If we update resources, classFiles are unchanged but jar changes
+        for(scalaFile <- os.walk(workspacePath).filter(_.ext == "txt")){
+          os.write.append(scalaFile, "\n")
+        }
+
+        assert(eval("classFiles"))
+        assert(eval("jar"))
+
+        val classFiles3 = meta("classFiles")
+        val jar3 = meta("jar")
+
+        assert(
+          jar2 != jar3,
+          classFiles2 == classFiles3
+        )
+
+        // We can intentionally break the code, have the targets break, then
+        // fix the code and have them recover.
+        for(scalaFile <- os.walk(workspacePath).filter(_.ext == "java")){
+          os.write.append(scalaFile, "\n}")
+        }
+
+        assert(!eval("classFiles"))
+        assert(!eval("jar"))
+
+        for(scalaFile <- os.walk(workspacePath).filter(_.ext == "java")){
+          os.write.over(scalaFile, os.read(scalaFile).dropRight(2))
+        }
+
+        assert(eval("classFiles"))
+        assert(eval("jar"))
+      }
+    }
+  }
+}
+